- libvlc control: uninitialiazed mutex and variables, was prevent browser...

- libvlc control: uninitialiazed mutex and variables, was prevent browser plugins from adding elements in playlist

src/control/core.c

@@ -98,6 +98,8 @@ libvlc_instance_t * libvlc_new( int argc, char **argv,
 
     p_new->p_libvlc_int = p_libvlc_int;
     p_new->p_vlm = NULL;
+    p_new->b_playlist_locked = 0;
+    vlc_mutex_init(p_libvlc_int, &p_new->instance_lock);
 
     return p_new;
 }